<template>
  <div class="app-container">
    <el-form
      :model="queryParams"
      ref="queryForm"
      size="medium"
      :inline="true"
      v-show="showSearch"
      label-width="68px"
    >
      <el-form-item label="资源名称" prop="resName">
        <el-input
          v-model="queryParams.resName"
          placeholder="请输入资源名称"
          clearable
          @keyup.enter.native="handleQuery"
        />
      </el-form-item>
      <el-form-item>
        <el-button type="primary" icon="el-icon-search" size="medium" @click="handleQuery">搜索</el-button>
        <el-button icon="el-icon-refresh" size="medium" @click="resetQuery">重置</el-button>
      </el-form-item>
    </el-form>

    <el-row :gutter="10" class="mb8">
      <el-col :span="1.5">
        <el-button
          type="danger"
          plain
          icon="el-icon-delete"
          size="mini"
          :disabled="multiple"
          @click="handleDelete"
          v-hasPermi="['course:res:remove']"
        >删除</el-button>
      </el-col>
      <el-col :span="5">
        <el-select
          v-model="queryParams.resType"
          placeholder="请选择"
          size="small"
          :clearable="true"
          @change="changeResType"
        >
          <el-option v-for="ditc in dict.type.res_type" :value="ditc.value" :label="ditc.label"></el-option>
        </el-select>
      </el-col>
      <right-toolbar :showSearch.sync="showSearch" @queryTable="getList"></right-toolbar>
    </el-row>

    <el-table v-loading="loading" :data="resList" @selection-change="handleSelectionChange">
      <el-table-column type="selection" width="55" align="center" />
      <el-table-column label="资源名称" align="center" prop="resName" :show-overflow-tooltip="true" />
      <el-table-column label="资源展示" align="center" prop="resUrl">
        <template slot-scope="scope">
          <el-image
            v-if="scope.row.resType==1"
            class="resImg"
            :src="scope.row.resUrl"
            :preview-src-list="[scope.row.resUrl]"
          ></el-image>
          <el-button
            v-else
            size="small"
            type="text"
            icon="el-icon-download"
            @click="handleDownLoad(scope.row.resUrl)"
            v-hasPermi="['course:res:edit']"
          >下载</el-button>
        </template>
      </el-table-column>
      <el-table-column label="资源类型" align="center" prop="resType">
        <template slot-scope="scope">
          <dict-tag :options="dict.type.res_type" :value="scope.row.resType" />
        </template>
      </el-table-column>
      <el-table-column label="资源大小" align="center" prop="resSize">
        <template slot-scope="scope">
          <span>{{byte2mb(scope.row.resSize)}}</span>
        </template>
      </el-table-column>
      <el-table-column label="创建时间" align="center" prop="createTime" width="150">
        <template slot-scope="scope">
          <span>{{ parseTime(scope.row.createTime, '{y}-{m}-{d} {h}:{i}') }}</span>
        </template>
      </el-table-column>
      <el-table-column label="修改时间" align="center" prop="updateTime" width="150">
        <template slot-scope="scope">
          <span>{{ parseTime(scope.row.updateTime, '{y}-{m}-{d} {h}:{i}') }}</span>
        </template>
      </el-table-column>
      <el-table-column label="操作" align="center" class-name="small-padding fixed-width">
        <template slot-scope="scope">
          <el-button
            size="mini"
            type="text"
            icon="el-icon-edit"
            @click="handleUpdate(scope.row)"
            v-hasPermi="['course:res:edit']"
          >修改</el-button>
          <el-button
            size="mini"
            type="text"
            icon="el-icon-delete"
            @click="handleDelete(scope.row)"
            v-hasPermi="['course:res:remove']"
          >删除</el-button>
        </template>
      </el-table-column>
    </el-table>

    <pagination
      v-show="total>0"
      :total="total"
      :page.sync="queryParams.pageNum"
      :limit.sync="queryParams.pageSize"
      @pagination="getList"
    />

    <!-- 修改资源对话框 -->
    <el-dialog :title="title" :visible.sync="open" width="500px" append-to-body>
      <el-form ref="form" :model="form" :rules="rules" label-width="80px">
        <el-form-item label="附件名称" prop="resName">
          <el-input v-model="form.resName" placeholder="请输入附件名称" />
        </el-form-item>
      </el-form>
      <div slot="footer" class="dialog-footer">
        <el-button :loading="buttonLoading" type="primary" @click="submitForm">确 定</el-button>
        <el-button @click="cancel">取 消</el-button>
      </div>
    </el-dialog>
  </div>
</template>

<script>
import { listRes, getRes, delRes, updateRes } from "@/api/course/res";

export default {
  name: "Res",
  dicts: ["res_type"],
  data() {
    return {
      // 按钮loading
      buttonLoading: false,
      // 遮罩层
      loading: true,
      // 选中数组
      ids: [],
      // 非单个禁用
      single: true,
      // 非多个禁用
      multiple: true,
      // 显示搜索条件
      showSearch: true,
      // 总条数
      total: 0,
      // 资源表格数据
      resList: [],
      // 弹出层标题
      title: "",
      // 是否显示弹出层
      open: false,
      // 查询参数
      queryParams: {
        pageNum: 1,
        pageSize: 10,
        resId: undefined,
        resName: undefined,
        resType: undefined
      },
      // 表单参数
      form: {},
      // 表单校验
      rules: {
        resName: [
          { required: true, message: "资源名称不能为空", trigger: "blur" }
        ],
        resType: [
          { required: true, message: "资源类型不能为空", trigger: "change" }
        ]
      }
    };
  },
  created() {
    this.getList();
  },
  methods: {
    /** 查询资源列表 */
    getList() {
      this.loading = true;
      listRes(this.queryParams).then(response => {
        this.resList = response.rows;
        this.total = response.total;
        this.loading = false;
      });
    },
    // 取消按钮
    cancel() {
      this.open = false;
      this.reset();
    },
    // 表单重置
    reset() {
      this.form = {
        resId: undefined,
        resName: undefined,
        resType: undefined
      };
      this.resetForm("form");
    },
    /** 搜索按钮操作 */
    handleQuery() {
      this.queryParams.pageNum = 1;
      this.getList();
    },
    /** 重置按钮操作 */
    resetQuery() {
      this.resetForm("queryForm");
      this.queryParams.resType = undefined;
      this.handleQuery();
    },
    // 多选框选中数据
    handleSelectionChange(selection) {
      this.ids = selection.map(item => item.resId);
      this.single = selection.length !== 1;
      this.multiple = !selection.length;
    },
    /** 修改按钮操作 */
    handleUpdate(row) {
      this.loading = true;
      this.reset();
      const resId = row.resId || this.ids;
      getRes(resId).then(response => {
        this.loading = false;
        this.form = response.data;
        this.open = true;
        this.title = "修改资源";
      });
    },
    /** 提交按钮 */
    submitForm() {
      this.$refs["form"].validate(valid => {
        if (valid) {
          this.buttonLoading = true;
          updateRes(this.form)
            .then(response => {
              this.$modal.msgSuccess("修改成功");
              this.open = false;
              this.getList();
            })
            .finally(() => {
              this.buttonLoading = false;
            });
        }
      });
    },
    /** 删除按钮操作 */
    handleDelete(row) {
      const resIds = row.resId || this.ids;
      this.$modal
        .confirm('是否确认删除资源编号为"' + resIds + '"的数据项？')
        .then(() => {
          this.loading = true;
          return delRes(resIds);
        })
        .then(() => {
          this.loading = false;
          this.getList();
          this.$modal.msgSuccess("删除成功");
        })
        .finally(() => {
          this.loading = false;
        });
    },
    /** byte转mb */
    byte2mb(b) {
      return (b / 1024 / 1024).toFixed(2) + "MB";
    },
    /** 下载资源 */
    handleDownLoad(url) {
      window.open(url, "_blank");
    },
    /** 更改文件类型 */
    changeResType() {
      this.getList();
    }
  }
};
</script>

<style scoped>
.resImg {
  display: block;
  margin: auto;
  width: 120px;
  height: 60px;
}
</style>
